Telluride Mountain Run 40 Mile

2026

The Telluride Mountain Run 40-mile takes place in late August above the historic mining town of Telluride, Colorado. This technical mountain race follows old mining roads, singletrack, and alpine tundra through the San Juan Mountains, with seven aid stations spread across the roughly 40-mile course. The route includes a particularly demanding 1.5-mile section of sharp ridgeline above 13,000 feet between Ajax Peak and Imogene Pass, where runners face significant exposure at extreme altitude. The course navigates mountain passes, exposed ridgelines, and high summits with substantial elevation gain throughout. Much of the route travels over terrain where the thin air at altitude becomes a factor as much as the climbing itself. Runners move through varied mountain environments, from mining roads in the lower sections to alpine tundra on the high ridges, with the San Juan Mountains providing dramatic backdrop views when weather permits. This race suits experienced mountain runners comfortable with technical terrain and high-altitude exposure. Runners who struggle with altitude or prefer more runnable courses may find the combination of elevation and technical demands challenging. The 15-hour time limit reflects the serious nature of the terrain, and the late August timing can bring variable mountain weather to consider alongside the altitude demands.